CN108051502B - A kind of detection method of cable fatigue damage - Google Patents
A kind of detection method of cable fatigue damage Download PDFInfo
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- CN108051502B CN108051502B CN201711183933.9A CN201711183933A CN108051502B CN 108051502 B CN108051502 B CN 108051502B CN 201711183933 A CN201711183933 A CN 201711183933A CN 108051502 B CN108051502 B CN 108051502B
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- conversion efficiency
- wave guide
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- signal
- striction wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
Abstract
The invention belongs to non-destructive testing correlative technology fields, it discloses a kind of detection methods of cable fatigue damage, detection method includes the following steps for this: (1) providing magnetic striction wave guide stimulus sensor and magnetic striction wave guide receiving sensor, and the magnetic striction wave guide stimulus sensor and the magnetic striction wave guide receiving sensor are separately mounted to the excitation end and receiving end of cable to be detected；(2) change the parameter of the magnetic striction wave guide stimulus sensor, the excitation process conversion efficiency curve under biased magnetic field strength to obtain different excitation ends；Similarly, change the parameter of the magnetic striction wave guide receiving sensor, the receive process conversion efficiency curve under the biased magnetic field strength to obtain different receiving ends；(3) it is compared according to the excitation process conversion efficiency curve or receive process conversion efficiency curve of acquisition and standard specimen to detect the fatigue damage of the cable.Detection method provided by the invention is simple, easy to implement, and flexibility is higher.
Description
Technical field
The invention belongs to non-destructive testing correlative technology fields, more particularly, to a kind of detection side of cable fatigue damage
Method.
Background technique
Cable is widely used in the structures such as bridge cable, prestress wire, has to the fatigue state detection of cable
Significance.With the development of non-destructive testing technology, more and more technologies are applied in the fatigue detecting of metal component,
Middle Magnetic Memory technology and non-linear ultrasonic technology are at present using more detection technique.
Currently, relevant technical staff in the field has done some researchs, as patent CN106769396A discloses one kind
Horizontal orientation drilling rod fatigue damage detection system, the detection system is using magnetic memory detection technology to drilling rod fatigue under different operating conditions
Damage process is monitored.What is utilized due to Magnetic Memory is spontaneous magnetic signal of the ferromagnetic material under the environment of earth's magnetic field,
Inevitably influenced by on-site test environment.In addition, existing magnetic striction wave guide detects cable fatigue damage technology
In, what is utilized is ultrasound non-linear parameter, need to extract signal progress frequency-domain analysis the value of fundamental wave and second harmonic, due to
Second harmonic is very faint, and testing result is easy to be influenced by detection system.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of detection sides of cable fatigue damage
A kind of higher cable fatigue damage of precision is studied and devised to method based on the detection feature of existing cable fatigue damage
Detection method, the detection method imitate the transducing of the magnetic striction wave guide conversion efficiency curve of cable to be detected and standard specimen
Rate curve comparison detects the fatigue damage of the cable, and the big of magnetostriction conversion efficiency is indicated using the amplitude of signal
It is small, the fatigue damage that can be detected cable by the extraction of time-domain signal is realized, convenience of calculation, detection is accurately.In addition, described
Detection method is changed based on the magnetic characteristic that fatigue damage will lead to steel wire in cable, and then influences magnetic striction wave guide transducing
The principle of efficiency is influenced smaller by on-site test environment.
To achieve the above object, the present invention provides a kind of detection methods of cable fatigue damage, which is characterized in that the inspection
Survey method the following steps are included:
(1) magnetic striction wave guide stimulus sensor and magnetic striction wave guide receiving sensor are provided, and the mangneto is stretched
Contracting guided wave stimulus sensor and the magnetic striction wave guide receiving sensor be separately mounted to cable to be detected excitation end and
Receiving end；
(2) change the parameter of the magnetic striction wave guide stimulus sensor, to obtain different excitation ends biased magnetic field strength
Under excitation process conversion efficiency curve；Similarly, change the parameter of the magnetic striction wave guide receiving sensor, to obtain not
With the receive process conversion efficiency curve under the biased magnetic field strength of receiving end；
(3) by the conversion efficiency curve of excitation process obtained or receive process conversion efficiency curve and standard specimen into
Row comparison, and the cable is detected with the presence or absence of fatigue damage according to comparing result.
Further, the excitation process conversion efficiency curve acquisition the following steps are included:
(11) parameter constant for keeping the magnetic striction wave guide receiving sensor, gradually changes the magnetic striction wave guide
The intensity of the bias magnetic field of stimulus sensor；
(12) magnetic striction wave guide obtained under different excitation end biased magnetic field strengths detects signal, intercepts the mangneto and stretches
First time in contracting Guided waves signal obtains amplitude of the first time by signal by signal；
(13) described is obtained by the amplitude of signal according to the excitation end biased magnetic field strength and the first time
The primary relation curve by signal amplitude and the excitation end biased magnetic field strength, i.e. excitation process conversion efficiency curve.
Further, the receive process conversion efficiency curve acquisition the following steps are included:
(a) parameter constant for keeping the magnetic striction wave guide stimulus sensor, gradually changes the magnetic striction wave guide
The intensity of the bias magnetic field of receiving sensor；
(b) magnetic striction wave guide obtained under different receiving end biased magnetic field strengths detects signal, and intercepts the mangneto
First time in flexible Guided waves signal obtains amplitude of the first time by signal by signal；
(c) described first is obtained by the amplitude of signal according to the receiving end biased magnetic field strength and the first time
The secondary relation curve by signal amplitude and the receiving end biased magnetic field strength, i.e. receive process conversion efficiency curve.
Further, when obtaining the excitation process conversion efficiency curve, the magnetic striction wave guide stimulus sensor
Including coil type bias magnetization device and excitation coil, the receiving sensor includes magneto bias magnetization device and receiving coil,
Further, when obtaining the receive process conversion efficiency, the magnetic striction wave guide receiving sensor includes
Coil type bias magnetization device and receiving coil, the stimulus sensor include magneto bias magnetization device and excitation coil,
Further, the size of the excitation process conversion efficiency and the size of the receive process conversion efficiency are direct
The amplitude for influencing signal, the size of magnetostriction conversion efficiency is indicated using the amplitude of signal.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, cable provided by the invention
The detection method of rope fatigue damage mainly has the advantages that
1. according to the receive process conversion efficiency curve of acquisition or the excitation process conversion efficiency curve and standard
The conversion efficiency curve of test specimen compares to detect the fatigue damage of the cable, indicates that mangneto is stretched using the amplitude of signal
The size of contracting conversion efficiency realizes the fatigue state that cable can be analyzed by the extraction of time-domain signal, convenience of calculation, detection
Accurately；
2. the detection method is changed based on the magnetic characteristic that fatigue state will lead to steel wire in cable, and then influences magnetic
The principle for causing flexible guided wave energy exchange efficiency, is influenced smaller by on-site test environment；
3. the detection method is simple, easy to implement, flexibility is higher, is conducive to promote and apply, and cost is relatively low, practical
Property is stronger.
Detailed description of the invention
Fig. 1 is the flow diagram of the detection method for the cable fatigue damage that better embodiment of the present invention provides；
Fig. 2 is the acquisition excitation process that the detection method for the cable fatigue damage that first embodiment of the invention provides is related to
Conversion efficiency curve sensor layout schematic diagram；
Fig. 3 is the acquisition receive process that the detection method for the cable fatigue damage that first embodiment of the invention provides is related to
Conversion efficiency curve sensor layout schematic diagram；
Fig. 4 is the time-domain signal figure of the steel strand wires in Fig. 2；
Fig. 5 is the excitation process conversion efficiency curve obtained using the detection method of the cable fatigue damage in Fig. 2；
Fig. 6 is the receive process conversion efficiency curve obtained using the detection method of the cable fatigue damage in Fig. 3.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Referring to Fig. 1, the detection method for the cable fatigue damage that better embodiment of the present invention provides, the detection method
It mainly comprises the steps that
Step 1, provides magnetic striction wave guide stimulus sensor and magnetic striction wave guide receiving sensor, and by the magnetic
Flexible guided wave stimulus sensor and the magnetic striction wave guide receiving sensor is caused to be separately mounted to excitation end and the reception of cable
End.
Specifically, the magnetic characteristic that will lead to steel wire in cable based on fatigue damage changes, and then influences magnetostriction
The magnetic striction wave guide stimulus sensor and the magnetic striction wave guide are received sensing respectively by the principle of guided wave energy exchange efficiency
Device is separately mounted to the receiving end and excitation end of cable, conversion efficiency curve and the excitation end thus to obtain the receiving end
Conversion efficiency curve, and then according to the conversion efficiency curve of obtained conversion efficiency curve and standard specimen compare come really
The fixed cable whether there is fatigue damage.
Step 2 changes the parameter of the magnetic striction wave guide stimulus sensor, to obtain the biasing magnetic at different excitation ends
Excitation process conversion efficiency curve under field intensity；Similarly, change the parameter of the magnetic striction wave guide receiving sensor, with
Obtain the receive process conversion efficiency curve under the biased magnetic field strength of different receiving terminals.
Specifically, the excitation process conversion efficiency acquisition the following steps are included:
(1) parameter constant for keeping the magnetic striction wave guide receiving sensor, gradually changes the magnetic striction wave guide
The intensity of the bias magnetic field (excitation end bias magnetic field) of stimulus sensor.
(2) magnetic striction wave guide obtained under different excitation end biased magnetic field strengths detects signal, intercepts the mangneto and stretches
First time in contracting Guided waves signal obtains amplitude of the first time by signal by signal.
(3) described first is obtained by the amplitude of signal according to the excitation end biased magnetic field strength and the first time
The secondary relation curve by signal amplitude and the excitation end biased magnetic field strength, i.e. excitation process conversion efficiency curve.
The acquisition of the receive process conversion efficiency the following steps are included:
(a) parameter constant for keeping the magnetic striction wave guide stimulus sensor, gradually changes the magnetic striction wave guide
The intensity of the bias magnetic field (receiving end bias magnetic field) of receiving sensor.
(b) magnetic striction wave guide obtained under different receiving end biased magnetic field strengths detects signal, and intercepts the mangneto
First time in flexible Guided waves signal obtains amplitude of the first time by signal by signal.
(c) described first is obtained by the amplitude of signal according to the receiving end biased magnetic field strength and the first time
The secondary relation curve by signal and the receiving end biased magnetic field strength, i.e. receive process conversion efficiency curve.
Step 3, the conversion efficiency of excitation process obtained or receive process conversion efficiency curve and standard specimen is bent
Line compares, and detects cable with the presence or absence of fatigue damage according to comparing result.
Specifically, mark is different from according to the conversion efficiency at excitation end of the cable of fatigue and the conversion efficiency of receiving end
The conversion efficiency at the excitation end of quasi- test specimen and the conversion efficiency of receiving end, the conversion efficiency and reception at the excitation end of tired cable
The conversion efficiency at end is relatively low, thus the excitation process conversion efficiency curve according to the cable to be detected obtained or reception
The conversion efficiency curve of process conversion efficiency curve and standard specimen compares to detect the fatigue damage of the cable.
Embodiment 1
Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 are please referred to, the cable to be measured that first embodiment of the invention uses is outer diameter
15.24mm, a length of 1300mm have the steel strand wires of fatigue damage, which passes through 2,000,000 CYCLIC LOADINGs；Stimulus sensor
It is made of coil type bias magnetization device and excitation coil, the excitation coil is set in the coil magnetizing device；Receive sensing
Device is made of magneto bias magnetization device and receiving coil；Excitation signal amplitude is 1V, periodicity 3, driving frequency when experiment
For 80kHz, motivating the bias current variation range in end line ring type bias magnetization device is 0~10A.One is separately taken to follow without passing through
The steel strand wires of ring load are as standard specimen, specification, experimental arrangement, driving frequency, excitation signal amplitude, periodicity and fatigue
It is all the same in steel strand wires experiment, to obtain the excitation process conversion efficiency curve of the not tired steel strand wires under the same terms.It can
To understand, when obtaining the receive process conversion efficiency curve, the magnetic striction wave guide receiving sensor includes coil type
Bias magnetization device and receiving coil, the stimulus sensor include magneto bias magnetization device and excitation coil.
The steel provided using the detection method of cable fatigue damage as described above first embodiment of the invention is twisted
Line is detected.Wherein, Fig. 4 is the reception signal for motivating end bias current when being 3A, and respectively illustrates electromagnetic pulse, first
It is secondary by signal and end echo.For the first time by signal, the first time is represented sharp by the amplitude size of signal for interception
Encourage the size of excitation process conversion efficiency when end bias current is 3A.Fig. 5 is under the biased magnetic field strength of different excitation ends
The size of excitation process conversion efficiency, wherein round curve indicates the excitation on the steel strand wires not Jing Guo CYCLIC LOADING
The conversion efficiency of journey, water chestnut shape curve indicate the conversion efficiency of the excitation process on the steel strand wires Jing Guo 2,000,000 CYCLIC LOADINGs.
Fig. 6 is the size of the receive process conversion efficiency under different receiving end biased magnetic field strengths, wherein round curve
Indicate the conversion efficiency of the receive process on the steel strand wires not Jing Guo CYCLIC LOADING, diamond shaped curve indicates passing through 200
The conversion efficiency of receive process on the steel strand wires of ten thousand CYCLIC LOADINGs.It can be seen that from the conversion efficiency curve in Fig. 5 and Fig. 6
The excitation of tired steel strand wires and receive process conversion efficiency curve are below the conversion efficiency curve of not tired steel strand wires, i.e., tired
The excitation and receive process conversion efficiency of steel strand wires are less than the conversion efficiency of not tired steel strand wires.This method can detecte out fatigue
Steel strand wires and not tired steel strand wires, therefore the detection method of visible cable fatigue damage provided by the invention is effective and reliable
's.
The detection method of cable fatigue damage provided by the invention, the detection method is according to the excitation process of acquisition
The conversion efficiency curve of conversion efficiency or the receive process conversion efficiency curve and standard specimen compares described to detect
The fatigue damage of cable is indicated the size of magnetostriction conversion efficiency using the amplitude of signal, realizes and pass through time-domain signal
Extraction can analyze the fatigue damage of cable, convenience of calculation, detection is accurate.In addition, the detection method is based on fatigue damage
The magnetic characteristic that will lead to steel wire in cable changes and then influences the principle of magnetic striction wave guide conversion efficiency, by scene
The influence for detecting environment is smaller, and precision is higher.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of detection method of cable fatigue damage, detection method includes the following steps for this:
(1) magnetic striction wave guide stimulus sensor and magnetic striction wave guide receiving sensor are provided, and the magnetostriction is led
Wave excitation sensor and the magnetic striction wave guide receiving sensor are separately mounted to excitation end and the reception of cable to be detected
End；It is characterized in that, step (1) is further comprising the steps of below:
(2) change the parameter of the magnetic striction wave guide stimulus sensor, under the biased magnetic field strength to obtain different excitation ends
Excitation process conversion efficiency curve；Similarly, change the parameter of the magnetic striction wave guide receiving sensor, to obtain difference
Receive process conversion efficiency curve under the biased magnetic field strength of receiving end；
(3) the conversion efficiency curve of excitation process obtained or receive process conversion efficiency curve and standard specimen is carried out pair
Than, and the cable is detected with the presence or absence of fatigue damage according to the comparing result of acquisition.
2. the detection method of cable fatigue damage as described in claim 1, it is characterised in that: the excitation process conversion efficiency
The acquisition of curve the following steps are included:
(11) parameter constant for keeping the magnetic striction wave guide receiving sensor gradually changes the magnetic striction wave guide excitation
The intensity of the bias magnetic field of sensor；
(12) magnetic striction wave guide obtained under different excitation end biased magnetic field strengths detects signal, intercepts the magnetostriction and leads
Wave detects the first time in signal by signal, and obtains amplitude of the first time by signal；
(13) first time is obtained by the amplitude of signal according to the excitation end biased magnetic field strength and the first time
Pass through the relation curve of signal amplitude and the excitation end biased magnetic field strength, i.e. excitation process conversion efficiency curve.
3. the detection method of cable fatigue damage as described in claim 1, it is characterised in that: the receive process conversion efficiency
The acquisition of curve the following steps are included:
(a) parameter constant for keeping the magnetic striction wave guide stimulus sensor gradually changes the magnetic striction wave guide and receives
The intensity of the bias magnetic field of sensor；
(b) magnetic striction wave guide obtained under different receiving end biased magnetic field strengths detects signal, and intercepts the magnetostriction
First time in Guided waves signal obtains amplitude of the first time by signal by signal；
(c) that the first time is obtained by the amplitude of signal according to the receiving end biased magnetic field strength and the first time is logical
Cross the relation curve of signal amplitude Yu the receiving end biased magnetic field strength, i.e. receive process conversion efficiency curve.
4. the detection method of cable fatigue damage as described in any one of claims 1-3, it is characterised in that: described sharp obtaining
When encouraging process conversion efficiency curve, the magnetic striction wave guide stimulus sensor includes coil type bias magnetization device and excitation line
Circle, the receiving sensor includes magneto bias magnetization device and receiving coil.
5. the detection method of cable fatigue damage as described in any one of claims 1-3, it is characterised in that: connect described in the acquisition
When receipts process conversion efficiency curve, the magnetic striction wave guide receiving sensor includes coil type bias magnetization device and reception line
Circle, the stimulus sensor includes magnetizing device with permanent magnet and excitation coil.
6. the detection method of cable fatigue damage as described in any one of claims 1-3, it is characterised in that: the excitation process
The size of conversion efficiency and the size of the receive process conversion efficiency directly affect the amplitude of signal, using the amplitude of signal
To indicate the size of magnetostriction conversion efficiency.
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| CN110471010B (en) * | 2019-09-18 | 2021-09-10 | 北京工业大学 | SH of magnetostriction curve of ferromagnetic material0Modal ultrasonic guided wave measuring method |
| CN110988109B (en) * | 2019-12-09 | 2021-11-19 | 华中科技大学 | Method for detecting connection quality of sleeve connecting piece based on magnetostrictive guided waves |
| CN111380949B (en) * | 2020-03-27 | 2022-03-15 | 华中科技大学 | Method for detecting defects of external threads of steel pipe based on sleeve connection |
| CN111912907B (en) * | 2020-07-22 | 2022-11-04 | 柳州欧维姆机械股份有限公司 | Intelligent inhaul cable system for evaluating corrosion broken wire and analysis method thereof |
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| JP3317190B2 (en) * | 1997-06-05 | 2002-08-26 | 日本鋼管株式会社 | Fatigue crack detection method |
| CN101393173B (en) * | 2008-08-29 | 2010-09-29 | 华中科技大学 | Staying cable anchorage zone magnetostriction wave guide detection system |
| CN104483322B (en) * | 2014-12-11 | 2017-05-31 | 长沙理工大学 | The detecting system of bridge rope |
| CN105806944B (en) * | 2016-03-16 | 2019-03-05 | 华中科技大学 | A kind of detection method and device of cable fatigue damage |
| CN106324105B (en) * | 2016-10-21 | 2023-06-06 | 华中科技大学 | Magnetostrictive guided wave detection device capable of sensing working point |
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